Use NOT to narrow search results by eliminating specific words or phrases from the search results for example student AND performance NOT musical will eliminate articles about student musical performances. While an effective strategy to reduce results, it may also eliminate documents with high relevancy to your topic.īoolean images obtained from The Boolean Machine by Rockwell Shrock,, retrieved 19 December 2016. Relevance of the retrieved items may depend upon the proximity of the words in the record (next to or near each other and in context). If the action type is list files, this option inverts the list of files. They aide in making keyword based text searches. Boolean search is defined as the structured process of using mathematical operators such as AND, OR, and NOT to limit the search on databases like Google. A boolean operator, or logical operator, consists of operators such as AND, OR, NOT, NOR, NAND, and XOR.These operators are used with conditional statements in programming, search engines, algorithms, and formulas. In PowerGREP you can do this with the invert search results checkbox in the file sectioning part of the action. Also known as logical operators, they are the use of Boolean operators (And, Or, Not). The more terms added to the search, the narrower the results will be. A boolean search for not a or for not a and not b gets you a list of files that don’t contain your search term (s). You're instructing the resource to retrieve only those documents or records containing both words or phrases for example "online programs" AND "student success " or in the illustration below endangered AND birds. However, this increases the possibility of reducing relevancy if you haven't selected the best keywords or concepts relationships. Think of using OR in terms of synonyms or related terms for example "challenges" OR "barriers" OR "weaknesses" or in the illustration below endangered OR birds. Further information can be found at the Google Advanced Search Page. Boolean SearchingHow to find the books and articles you need quicker . What sets Boolean logic apart from other logical systems is that it focuses strictly on binary variables, which usually come in the form of 1s and 0s representing true and false. Google: North Carolina yields much more directed searches than Google: North Carolina. Boolean logic is a subsection of algebra that describes a set of simple rules and gates to help compare and manipulate logical statements. This expands the search to include all records containing either concept. As noted above, if you want to search for an exact phrase such as North Carolina, you enclose the phrase in quotation marks. Using the Boolean terms: AND, OR, NOT, the searcher is able to define relationships among concepts. Boolean searching allows the user to combine or limit words and phrases in an online search in order to retrieve relevant results.
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